The Trade Disputes Act of 1929 provided for

1. A

   the participation of workers in the management of industries.

   (a) Participation of workers in management. That idea is later industrial-democracy language, not the 1929 Act. It is not the key.

2. B

   arbitrary powers to the management to quell industrial disputes.

   (b) Arbitrary powers to management to quell disputes. The Act did not simply hand managers a free truncheon. It is not the key.

3. C

   an intervention by the British Court in the event of a trade dispute.

   (c) Intervention by the British Court in a trade dispute. The statute set up a domestic tribunal route, not routine British-court takeover. It is not the key.

4. D

   a system of tribunals and a ban on strikes.

   (d) A system of tribunals and a ban on strikes. The Trade Disputes Act, 1929 provided Courts of Inquiry / Conciliation Boards and made certain strikes and lockouts illegal (especially in public utility services without notice). That is the official key.

Summary. Official key is (d) a system of tribunals and a ban on strikes. The 1929 Act created inquiry and conciliation machinery and criminalised specified strikes and lockouts, particularly sudden strikes in public utilities. It was a colonial industrial-relations statute, not workers’ participation in management and not a blank cheque of arbitrary managerial power. The later Trade Disputes Act, 1947 and the Industrial Disputes Act, 1947 are the neighbouring laws.